Sounds like your Windpro might not actually be Windpro. I just made my first fleece cover with lightweight Windpro as an outer and microfleece as an inner. It seems to be pretty bulletproof. I had a pretty wet fitted diaper under it and didn't feel any dampness. The Windpro I have feels rather different than regular fleece. It is smoother and denser - almost a suede sort of feeling - not as fluffy as 200 or 300 weight. What does your's feel like?